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Old 04-24-2015, 08:34 AM   #20 (permalink)
oldtamiyaphile
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Join Date: May 2009
Location: Australia
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UFI - '12 Fiat 500 Twinair
Team Turbocharged!
90 day: 40.3 mpg (US)

Jeep - '05 Jeep Wrangler Renegade
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Quote:
Originally Posted by redpoint5 View Post
My advice is to leave the alternator in place and figure out how to switch it on and off. The pulley has so little drag as to have an unmeasurable effect on MPG. I doubt the truck would run without electricity since the "ignition" that your key controls will kill it when turned off. My truck uses an electric fuel pump, so it needs a good electricity source at all times.
Didn't Darin test this? IRC he found a 5% gain by switching the alt off, but another 5% (10% total) with the belt removed in his Metro. I suspect a larger engine won't see as much benefit.
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